/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassEntityManager.h
CreateArchetype from a composition descriptor and initial values
a handle of a new archetype
[FMassArchetypeHandle](API\Plugins\MassEntity\FMassArchetypeHandle) CreateArchetype ( const [FMassArchetypeCompositionDescriptor](API\Plugins\MassEntity\FMassArchetypeCompositionDescrip-) & Composition, const [FName](API\Runtime\Core\UObject\FName) ArchetypeDebugName )